We found 4 dictionaries that define the word addition reactions:

General (2 matching dictionaries)

1. addition reactions: Wiktionary
2. addition reactions: TheFreeDictionary.com

Computing (1 matching dictionary)

3. addition reactions: Encyclopedia

Medicine (1 matching dictionary)

4. General Glossary (No longer online)

(Note: See addition_reaction as well.)

Definitions from Wiktionary (addition reaction) ▸ noun:  (chemistry) a reaction in which radicals are added to both sides of a double or triple bond ▸ Also see addition_reaction ▸ Words similar to addition reactions ▸ Usage examples for addition reactions ▸ Idioms related to addition reactions ▸ Wikipedia articles (New!) ▸ Words that often appear near addition reactions ▸ Rhymes of addition reactions ▸ Invented words related to addition reactions